双气头多联产系统的AspenPlus实现及工艺过程优化_工艺操作参数分析

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614Vol61No420104CIESCJournalApril2010AspenPlus()郑安庆,冯杰,薛冰,宋云彩,李文英(,030024):,,CH4/CO2,CH4/CO2(),,:;;;CH4/CO2;;;:TQ536:A:0438-1157(2010)04-0979-09ModelingandoptimizationofpolygenerationsystemwithcokeovengasandcoalgasifiedgasbyAspenPlus()DeterminationofoptimaloperatingparametersZHENGAnqing,FENGJie,XUEBing,SONGYuncai,LIWenying(KeyLaboratoryofCoalScienceandTechnology,MinistryofEducationandShanxiProvince,TaiyuanUniversityofTechnology,Taiyuan030024,Shanxi,China)Abstract:Oxyfuel(alcohol,DME,etc.)isthemainchemicalproductofthecoalbasedpolygenerationsystemInthissystem,25%(vol)methaneinthecokeovengasisreformedwith23%(vol)CO2inthegasifiedgas,andthesyngasataproperH/CratioisfurtherchangedtooxyfuelItisasystemwithenergysavingandfriendlyenvironmentThesynthesisofoxyfuelisthekeyunitfordeterminingtheefficiencyandeconomicsforthepolygenerationsystemInthisstudy,AspenPlussoftwarewasemployedtoestablishanintegratedcoalbasedpolygenerationflowsheetInthesimulation,theequivalentyieldofmethanolandconversionofCH4andCO2wereusedastheobjectivefunctionsforoptimizingtheoperationparametersinthewholepolygenerationsystemFurthermore,thesynergeticeffectintheonestepDMEsynthesisprocesswasinvestigated.Keywords:polygenerationsystem;coalgasifiedgas;cokeovengas;CH4/CO2reforming;DME;methanol;processsimulation2009-11-05,2009-12-30::(1984),,:(U0970134);(2005CB221201,2005CB221207);(IRT0517)Receiveddate:2009-11-05.Correspondingauthor:LIWenying,ying@tyuteducnFoundationitem:supportedbytheNationalNaturalScienceFoundationofChina(U0970134)andtheNationalBasicResearchProgramofChina(2005CB221201,2005CB221207)andtheProgramforInnovativeResearchTeaminUniversityofChina(IRT0517).,,/,CO2,,,,,[13],,,,,[4],,,[56]9,,[7]9,[8],,,,,,,,[5],,,,,,,,,,CH4/CO2,111CH4CO2:,(1),,CH4/CO2,T1(2)T1,,,CH4/CO2,P1(3)T1P1,,CH4/CO2,V112():,,(1),,CH4/CO2,T2(2)T2,,,CH4/CO2,P2(3)T2P2,,,CH4/CO2,V2(4)T2P2V2,,,CH4/CO2,K(5)T2P2V2K,!980!61,CH4/CO2,N,(,;,),CO2,,2CH4/CO2,,,1,,(),CH4/CO2CH4/CO2[9]CH4+CO22CO+2H2(H0298=+247900kJ!mol-1)(1)CO2+H2CO+H2O(H0298=-41270kJ!mol-1)(2)4[1011]CO+2H2CH3OH(H0298=-94084kJ!mol-1)(3)CO2+3H2CH3OH+H2O(H0298=-52814kJ!mol-1)(4)CO+H2OCO2+H2(H0298=-41270kJ!mol-1)(5)2CH3OHCH3OCH3+H2O(H0298=-19760kJ!mol-1)(6)(3)(4),(5),(6),,1Fig1Schematicdiagramofdualgassourcedpolygenerationsystem!981!4:AspenPlus()1,600m3!h-1,,600m3!h-1,(1),,32672733m3!h-1,2CH4/CO2,CH4CO2COH2,1Table1CompositionofcokeovengasandcoalgasifiedgasComponentCokeovengas/%(mol)Gasifiedgas/%(mol)CO602032H25903025CH426014CO2302212N26025912Table2InitialoperationconditionofkeyunitsOperationunitOperationconditionCH4/CO2reformingreactor850∀01MPa5000L!h-1!(kgcat)-1DMEsynthesisreactor250∀70MPa5000L!h-1!(kgcat)-1COCO2CH4CH4+CO2,(mol!s-1)CH4+CO2YMEP=(FCH3OH+2FDME)out(FCO+FCO2+FCH4)in#100%(7)YC=(FCH4+FCO2)in-(FCH4+FCO2)out(FCH4+FCO2)in#100%(8)Fii,in,out3,,[1213],,CH4/CO2,,H2/COCH4/CO2,,CH4/CO231CH4/CO2,CH4/CO2CH4+CO2311催化重整反应温度的优化结果2,,,CH4+CO2,CO+H2,[(3)(4)],[(6)],(3)~(5),,,900∀,,,,900∀312催化重整反应压力的优化结果900∀,3,,CH4+CO2[(1)(2)],,(1),CH4+CO2,!982!612CH4+CO2Fig2Effectofreformertemperatureonmethanolequivalentyield,CH4+CO2conversionandDMEproductivity∃methanolequivalentyield(singlestep)%methanolequivalentyield(twosteps)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep)CO+H2,,,,,,01MPa313催化重整反应空速的优化结果,,,,4,,CH4+CO2,,CH4+CO2,CO+H2,(3)(4)(6),,,4,3000L!h-1!(kgcat)-12000L!h-1!(kgcat)-1,,2000L!h-1!(kgcat)-1[1415],3000L!h-1!(kgcat)-132321液相一步法二甲醚合成反应温度优化结果,,!983!4:AspenPlus()5CH4+CO2Fig5EffectofDMEsynthesistemperatureonmethanolequivalentyield,CH4+CO2conversionandDMEproductivity∃methanolequivalentyield(singlestep)%methanolequivalentyield(twosteps)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep)(,),,55,,,,CH4+CO2,,,,,260∀,,,,(5),,CH4+CO2,CH4+CO2,,CH4+CO2,238∀,,(6),,,238∀,,260∀250~260∀,260∀,260∀322液相一步法二甲醚合成反应压力优化结果,,(,),,66CH4+CO2Fig6EffectofDMEsynthesispressureonmethanolequivalentyield,CH4+CO2conversionandDMEproductivity∃methanolequivalentyield(singlestep)%methanolequivalentyield(twosteps)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep)6,,,,CH4+CO2,(3)(4),,(3)(4),,[(6)];(5),CO2,CH4+CO25MPa,[(6)],,,(5),CO2,CH4+CO2,5~6MPa,,,,(6),!984!61,,[13],,6MPa323液相一步法二甲醚合成反应空速和催化剂质量比优化结果,(),260∀6MPa,,1(1,,,7,,,CH4+CO2,,[13],5000L!h-1!(kgcat)-17CH4+CO2Fig7EffectofDMEsynthesisspacevelocityonmethanolequivalentyield,CH4+CO2conversionandDMEproductivity∃methanolequivalentyield(singlestep)%methanolequivalentyield(twosteps)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep),,8,(/),,,CH4+CO2(/),,(6),,,,(3)(4),,(5),,CH4+CO2,1(18CH4+CO2Fig8Effectofcatalystloadingonmethanolequivalentyield,CH4+CO2conversionandDMEproductivity∃methanolequivalentyield(singlestep)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep)331,,H2/CO,600m3!h-1,9,,,,CH4+CO2CH4H2,,(1)(2)!985!4:AspenPlus()9CH4+CO2Fig9Effectofflowratioofcokeovengastogasifiedgasonmethanolequivalentyield,DMEproductivityandconversionofCH4+CO2∃methanolequivalentyield(singlestep)%methanolequivalentyield(twosteps)&conversionofCH4+CO2(singlestep)∋productivityofDME(singlestep),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